Two-phase flow of refrigerants during evaporation under constant heat flux in a horizontal tube

2005 ◽  
Vol 32 (3-4) ◽  
pp. 386-402 ◽  
Author(s):  
Wisis Sripattrapan ◽  
Somchai Wongwises
Keyword(s):  
Heat Flux ◽  
Two Phase Flow ◽  
Horizontal Tube ◽  
Constant Heat Flux ◽  
Phase Flow ◽  
Constant Heat ◽  
Two Phase

Variations of Buoyancy-Induced Mass Flux From Single-Phase to Two-Phase Flow in a Vertical Porous Tube With Constant Heat Flux

1999 ◽  
Vol 121 (3) ◽  
pp. 646-652 ◽  
Author(s):  
T. S. Zhao ◽  
Q. Liao ◽  
P. Cheng
Keyword(s):  
Heat Flux ◽  
Mass Flux ◽  
Single Phase ◽  
Two Phase Flow ◽  
Constant Heat Flux ◽  
Heat Fluxes ◽  
Phase Flow ◽  
Constant Heat ◽  
Two Phase ◽  
Porous Tube

This paper presents an experimental study of a buoyancy-induced flow of water with phase-change heat transfer in a vertical porous tube heated at a constant heat flux. Experiments were carried out from subcooled liquid flow to connective boiling by varying the imposed heat fluxes. At a prescribed heat flux the steady-state mass flux of water, as well as the temperatures along the tube wall and along the centerline of the packed tube, were measured. It is shown that for both single-phase flow and the two-phase flow with a rather low vapor fraction, the induced mass flux increased as the heat flux was increased. However, as the imposed heat flux was increased further, the induced mass flux dropped drastically, and remained relatively constant afterwards. The influences of various parameters such as the porous tube diameter, the particle sizes, and the hydrostatic head on the induced mass flux are also examined.

Measurements and modeling of two-phase flow in microchannels with nearly constant heat flux boundary conditions

2002 ◽  
Vol 11 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Lian Zhang ◽  
Jae-Mo Koo ◽  
Linan Jiang ◽  
M. Asheghi ◽  
K.E. Goodson ◽  
...  
Keyword(s):  
Heat Flux ◽  
Boundary Conditions ◽  
Two Phase Flow ◽  
Constant Heat Flux ◽  
Phase Flow ◽  
Constant Heat ◽  
Two Phase ◽  
Flux Boundary Conditions

Effect of Nanoparticle Concentration on Thermo-Hydraulic Behavior of a Nanofluid in a Horizontal Tube with Constant Heat Flux and Mass Flow Rate

2011 ◽  
Vol 110-116 ◽  
pp. 3650-3656
Author(s):  
S. Mirmasoumi ◽  
A. Behzadmehr
Keyword(s):  
Heat Flux ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Horizontal Tube ◽  
Constant Heat Flux ◽  
Tube Length ◽  
Nanoparticle Concentration ◽  
Constant Heat ◽  
Two Phase

How nanoparticle concentration affects on thermal and hydrodynamic parameters of a nanofluid (water+Al2O3) is numerically investigated in a horizontal tube while these parameters are impressed by buoyancy force under constant heat flux and mass flow rate. Comparisons with previously published experimental and numerical works on mixed convection in horizontal tubes show good agreements between the results. Results which are obtained using the two – phase mixture model indicate that adding the nanoparticles causes changes in the properties of nanofluid and finally increases the temperature of the flow. Whereas, dimensionless pressure drop along the tube length could increase with the nanoparticle concentration.

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